Kettle features explained


Kettle features explained

by Matt Clear

What should you look for when buying an electric kettle? Find out about the kettle features you'll need, plus those not worth the cash.

Put us to the test

Our Test Labs compare features and prices on a range of products. Try Which? to unlock our reviews. You'll instantly be able to compare our test scores, so you can make sure you don't get stuck with a Don't Buy.

  • Get the Which? verdict from our independent experts
  • Weigh up the pros and cons in an instant
  • Go to town on the details with our full review
  • Read our member reviews to see what they think
  • Is it a Don’t Buy? It could be a dud, and a costly one too
  • Best Buy
  • Don't Buy
  • 244 Kettles available

Some kettles have extra features that can help make tea breaks a pleasure, not a chore. They'll either save you time when using or cleaning your kettle, or make it more comfortable to lift and pour. 

Here we explain which features are useful and which ones you can ignore. Or if you just want to know which kettles scored best in Which? tests, jump straight to our Best Buy kettles.

Essential kettle features

Limescale filter

This is the mesh filter that is typically found in the spout, and is particularly essential if you live in an area with hard water. 

It should be easy to remove for cleaning, and the mesh should be fine enough and fit well to stop any limescale getting into your cup.

Our kettle reviews rate every kettle for how effective its limescale filter is, as well as whether it's easy to remove, clean and put back in.

Boil-dry protection

This automatically turns the kettle off if it doesn't contain enough water.

Power ratings

The power of a kettle ranges from about 2.2kW to 3kW – higher-wattage kettles are more powerful and so boil faster. Most kettles now have a wattage of 3kW, but we've found that kettles with similar power levels don't always boil at the same speed.

Each of our kettle reviews tells you how long the kettle takes to boil a litre of water, so we can guide you to the fastest models.

Water level markings

All kettles have a recommended minimum amount of water for boiling, but not every model on test has the minimum level clearly marked.

If both right- and left-handed people are going to be using the kettle, look for water level windows on both sides of the kettle. If there is a window under the handle, make sure the markings are still visible when you’re holding the handle during filling.

Our kettle reviews rate each kettle for how easy it is to see the water level, based on whether they have one or two windows or gauges, where they are positioned and how clear the markings are.

Useful kettle features

Cordless versus corded kettles

Most kettles are now 'cordless'. The power cord attaches to a separate power base so you're not restricted by the length of the cord when filling and pouring. Cord lengths for most kettles we've reviewed and rated range from 65cm to 80cm, but they can be up to 1m – useful if your power socket is in an inconvenient location.

Illuminated kettles 

Most kettles have some sort of illumination to show when they're switched on. The most basic types are a simple light, but illuminating blue switches have recently become all the rage. Glowing water gauges or bases are also common, and are helpful when using the kettle in low light.

To persuade you to part with even more cash, some kettles now illuminate the entire transparent body of the kettle. The colour changes colour as the water boils - often from blue to red.

Multiple temperature settings

Some kettles let you alter the temperature the water is heated to. This is a feature particularly worth looking out for if you're going to be using the kettle to make coffee or green tea. 

Coffee is best made with water that's around 90-95°C, while green tea is best with water that's 70-80°C, so look out for kettles that let you set the temperature within these ranges.

Kettle water filters

Some kettles have a built-in water filter to save you having to use a separate water filter jug to fill your kettle. Water is poured into a top container and then filters through into the main body of the kettle. They use replaceable cartridges that generally last one to two months between changes.

Keep-warm function

When this button is pressed, the kettle keeps the water inside warm after you've boiled it, either by warming the water gently or periodically re-boiling it.

Keep-warm functions can use more energy keeping a litre of water warm for 30 minutes and then re-boiling it than would be used to simply re-boil it after a half-hour wait. So it's best to boil only the amount of water you need each time.

360-degree base

A 360-degree base means you can replace the kettle on the base to face in any direction. Most kettles now have this feature.

Concealed element

Most of the kettles we've tested have concealed elements, which makes them easier to clean, but there are still some kettles available that have exposed elements.

Cool-touch body

Some kettles have an insulated body so that the outside remains cool enough to touch, even when the water inside is boiling.

Soft-touch handle

A soft rubberised area on the handle can make it more comfortable to grip and lift.

Now find the perfect kettle for you by checking out our kettle reviews.